Vehicle Gas Consumption - Accurate?

And, of course, the real problem is that people are calculating their mileage at various pumps at various stations at various times of day--which is inherently less than accurate.

One can't stop something one never started. You?

So tell us, oh wise one, which occupies more volume, a gallon of gasoline or a gallon of ethanol?

How about this one, oh asshat?

Which has greater energy content and which will produce more work against a calibrated standard energy source?

He'll tell us that after he tells us which weighs more, a pound of feathers or a pound of lead.

More importantly, why would anyone care when calculating how many miles that specified volume of fuel drove the car?

The greater energy content will be REFLECTED in the calculation--so? It's still a calculation of "volume in against miles driven". Energy content doesn't play in that particular calculation.

And now we know why you dropped out of engineering school. Or was that junior high school...

Apparently not in the Prius trip computer's consistent erroneous calculations, however, which was the OP's observation and recurring topic of this post.

Right, skippy.

Too bad wherever you went didn't educate you in scientific method or analytical problem solving techniques. But do keep posting and confirming.

How about a pound of your bullshit posts. Really weighty stuff.

The "erroneous calculations" he inferred were the Prius's dashboard numbers vs. his off-the-cuff at the pump numbers.

Yeah, no *wonder* they were different.

Or are you saying that his at the pump numbers are correct...???

He's getting two different numbers. You're calling one of them erroneous, which means de facto you think the other one is not.

Which junior high school did you flunk out of again?

OP reported consistently 6.5% lower actual than Prius gauged MPG.

Consistently.

Is your problem a lack of reading comprehension skills or total friggin stupidity?

And you figured that his at the pump numbers were correct? As opposed to the Prius numbers?

Tell us again how a "volume per miles" calculation requires knowledge of the energy content of the fluid itself, instead of simply reflecting the energy content of the fluid itself.

Work per gallon. Figure it out. Take your time.

Your question is irrelevant to finding the answer to the original question. The two factors in mpg are miles, the distance traveled, and gallons. You don't need to know the energy content of a gallon to measure it. A gallon is a unit of volume, not energy.

The "original question" was not an MPG calculation.

The "original question" is "why is the Prius calculated MPG

Not one time, *consistently* wrong.

Of course, in YOUR scientific method you know that it was "consistently wrong" HOW? By reading the newsgroup?

It differed from the ad-hoc at the pump calculation. Which one, if either one, was correct?

Hardly 'ad hoc'; *consistently high* trip computer calculation.

And the energy content of the fuel is not the answer. It doesn't even enter into the calculation. The calculation only includes distance traveled in miles and volume of fuel in gallons. The volume of the fuel in gallons is calculated based on the flow rate of the injectors and the length of the pulses they are kept open for, both recorded in the computer data. If the injector is not the size it is supposed to be the volume passing through it is calculated incorrectly and you will come up with a consistently high or low mpg because the volume being entered for each pulse is incorrect. It has nothing to do with energy content, just calibration.

Try again: E-N-E-R-G-Y C-O-N-T-E-N-T defines W-O-R-K

neither of which has anything directly to do with V-O-L-U-M-E measurements.